George s



(No Model.) 4 Sheets-Sheet 1.

W. SELLERS, G. S. STRONG & H. B. BRADFORD.

I I STEAM BOILER.

No. 544,130. Patented Aug. 6, 1895.

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(No Model.) 4 Sheets-Sheet 2 W. SELLERS, G@ S. STRONG & H. B. BRADFORD.STEAM BOILER.

tente Aug 6, 1895.

WITNESSES: 1//v VEA/TO/Ps (No Model.) 4 Sheets-Sheet 3.-

W. SELLERS. G. S. STRONG 85 H. B. BRADFORD. STEAM BOILER.

(No Model.) 4 Sheets Sh'eet 4. W. SELLERS. S. STRONG 85 H. B. BRADFORD.

STEAM BOILER.

,130. Patente.

m/mvms 9i WITNESSES:

- UNITED STATES PATENT. OFF ICE WILLIAM SELLERS, OF PHILADELPHIA,PENNSYLVANIA, GEORGE S. STRONG,

OF NEW YORK, N. Y., AND HENRY B. BRADFORD, OF WILMINGTON, AS-

SIGNORS TO THE EDGE MOOR IRON WARE.

OOMPANY, OF EDGE MOOR, DELA- STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 544,130, dated August6, 1895.

Application filed May 1,1896. Serial No. 547,741. (No model.)

To all whom it may concern: 7

Be it known that we, WILLIAM SELLERS, of the city of Philadelphia, inthe State of Pennsylvania, GEORGE SIMPsoN STRONG, of the city of NewYork, in the State of New York,

and HENRY BANNING BRADFORD, of the city of Wilmington, in the State ofDelaware, have invented certain new and useful Improvements inSteam-Boilers, of which improvements the following is a specification.

These improvements relate to that class of cylindrical steam-boilersknown as internally-fired return tubular.

This form of boiler is usually provided with two furnaces and a manholebetween and below them for access to the interior of the boiler-shelland an uptake within the boiler near the rear end, into which theproducts of combustion from the furnaces are discharged, and from whichthey are carried through tubes above the furnaces to a smoke-flue at thefront of the boiler and above its fire-doors to the boiler is pushed toits maximum. Moreover,

the smoke-flue being above the firing-doors compels the discharge of theproducts of combustion upward, whereby the light cinders and ashes mustbe carried forward with the current of heated gases without opportunityto separate otherwise than as a deposit in the fines or tubes, Whileashes accumulate in the uptake, which cannot be removed while the boileris in service.

One object of our improvement, therefore, is to apply the greatest heatas near as possible to the surface of the water and at the same time torender the interior of the boiler accessible throughout its length, alsoto avail of the greater specific gravity of the cinders and ashes and toseparate them from the gaseous products of combustion whenever thedownward direction of the currents of gaseous products ischanged. 7

Another is to carry off the products of combustion to the chimneyalongthe under side of the boiler and at the same time provide for outremoving from the boiler any part of the covering of its smoke-fiues;and another is to provide a descending smoke-flue on the front head ofthe boiler outside of and between and below the fire-door frames, whichflue forms an extension of the ash-pits under the furnaces.

To these ends our invention consists in two or more furnaces withcombustion-chambers, which respectively connect the front and back headsof the boiler and open through both, a smoke-flue outside the back head,and return-tubes secured inboth heads between and below the tops of thefurnaces and combustion-chambers.

It further consists in downward smokefiues with cleansable receptaclesbelow their outlets for the products of combustion.

It further consists in a series of horizontal tubes arranged in verticallines and a hingejointed cover secured upon the front smokeflue, thejoint in this cover in a plane that will pass between the vertical linesof the tubes.

It further consists in a smoke-flue, the top of which is the boiler,from which the two sides and one end of the flue are suspended andpenetrate a sand-joint on the bottom to a depth that will practicallyexclude the air.

It further consists in two fixed supports at one end of a boiler and tworoller-supports at the other, the weight at the roller end transmittedto the rollersupports respectively through a ball and socket, and itfurther consists in a descending smoke-flue on the front boiler-head,which flue is outside of and between and below the fire-door frames andforms an extension of the ash-pits under the furnaces.

That our improvements may be more clearly understood, we will nowdescribe the drawings, which form a part of this specification, in whichFigure 1 represents a view of the front end of our boiler, showing thefiring doors and frames with the descending smoke-flue at this endbetween and below the firing-door frames. Fig. 2 is a view of thedescending smoke-flue at the back end of the boiler with itscleaning-door. Fig. 3 is a side elevation of the boiler, showing itsdescending smokeliues at the back and front ends and the line underneaththe boiler. Fig. 4: is a cross-section of the boiler on the line a a,Fig. 3. Fig. 5 is a cross-section of the boiler on the line b b, Fig. 3;and Fig. 6 is a longitudinal section of the boiler on the lines'c d c,Fig. 1.

In all of the figures similar letters indicate similar parts.

The fire-door e, grate-bars f f, and bridgewall g are clearly shown withthe furnaces A A, Figs. t and 6. The bridge-walls g g rest upon bars h,which are supported by their ends resting against the curved sides ofthe furnaces A A, and under the bars 77. are stopper-plates z i,whichare removable for the purpose of cleaning the ashes from thecombustion-chambers B B at the rear of and securely fastened to thefurnaces A A.

The front head 0 of the boiler is flanged to receive the ends of the twofurnaces A A, to which it is firmly riveted, and the rear ends of thecombustion-chambers B B are flanged to afford suitable attachment to theback head D, to which they are securely riveted, and openings slightlylarger than the interior of the combustionchambers B B are made throughthe back head D, which admit the products of combustion from thefurnaces A A to pass into the descending smoke flue E. This smoke-flueis composed of plates of iron or steel suitably joined and braced withangle and T irons and securely fastened to the rear end of the boiler.its interior is lined with fire-brick, as shown, and its exterior, asalso that of the boiler, is covered with suitable nonconductingmaterial. This fine E extends below the bottom of the boiler to form areceptacle F for the light cinders and ashes that will be carriedthrough the combustion-chambers B B by the currents of gaseous productsof combustion, from which, by reason of their greater specific gravity,they will tend to separate, as these currents change their downwarddirection to a horizontal one to enter the tubes G G.

The receptacle F is provided with a door F, shown in Figs. 2 and 6,through which the contents of the receptacle can be convenientlyremoved.

The location of the tubes G G in the boilerheads 0 and D is clearlyshown in Figs. 4 and 5. The space in the bottom of the boiler isprovided for access to clean or repair the boilershell or the tubes, andentrance thereto is afforded through the manhole H, Fig. 6. The tops ofthe highest tubes are not required to extend above the tops of thefurnaces to afford sufficient draft area and they are limited to thisline that the water-level maybe conveniently determined. The ends of thetubes G G are expanded into the front and back heads 0 and D of theboiler, and these tubes, with the furnaces A A and combustion-chambers BB, afford efficieut support for the boileu heads.

The descending smoke-line I and its doors for adording access to thetubes for cleaning them are shown in Figs. 1, 3, and 6.

The fire-door frames J J are secured against the front head of theboiler in the usual way, and the smoke-flue I is between and below thefire-door frames, extending outward from the boiler-head a distancesufficient to afford the requisite draft area, and the top of that partof the flue under the fire-doors conforms to the curvature of thefurnace, so as to extend the ash-pits thereof. The front of thissmokeflue is partially covered by the hinge-jointed doors K K, theopening through the front plate of the smoke-flue under the doors beingsuch as to permit any tube to be withdrawn from the boiler through thisopening. The doors are bolted to the front plate of the fine and arehinged together by the hingesjjj.

\Vhen it is desired to clean the inside of the tubes one of the doors isunbolted from the smoke-fine and swung backward over the other and whenthe tubes opposite this door are cleaned the door is replaced andreboltcd to the line. The other door may then be treated in the sameway, and when its tubes are cleaned it can be replaced and secured asbefore.

It is necessary for the purpose of repairing or for cleaning the tubesthat the hinge-joint of the doors shall he opposite the space be-,

tween the tubes, as otherwise all of the tubes could not be exposed, andthusarranged each door becomes in turn the fulcrum-post for the other toswing upon.

That part of the smoke-flue 1 below the doors K K is coveredpermanently, and this part of the flue is carried down below thehorizontal flue L, which passes under the boiler, so as to form areceptacle for ashes at this point, and a sliding door 70 in the underside of the fine I is provided for their convenient removal.

The smoke-flue L is formed by plates Z Zsecured to the under side of theboiler, as shown in Figs. 4 and 5, the lower edges stiffened by angles mm, below which the plates project into troughs n n filled with sand, theplates entering the sand to a depth which will practically exclude theair from entering the flue, while the sand will permit freedom ofmovement to the plates. The back end of the flue L is closed by a plate0, Fig. 6, secured to the boiler at its upper edge, and at its loweredge it enters a trough filled with sand, like the side plates. Thetroughs for sand extend thus around the flue L, which may then extendfrom the descending smoke-flue I on the front head of the boiler to thedescending smoke flue E on the back head, and as the boiler itself formsthe top of the 'flue L the whole length of the boiler is exposed to theheat of this flue. We have described these troughs as filled with sand,that being the substance commonly used for such a purpose, but any othergranular substance that is sufficiently fine and refractory may be used.

The boiler is supported upon four piers of masonry, two on each side ofthe flue L. Upon the two M M at the front end, Figs. 3 and 4, twocastings N N are secured, which fit the curvature of the boiler and aresupported thereon by the plates 19 p, which are riveted to theboiler-shell. Similar castings N N are fitted and supported by'theplates 19 p on the boiler-shell at the back end of the boiler; but thatpart of these castings over the piers M M at thisend are provided withsockets, into which hemispherical projections on the centers of theplates P P are fitted. The under sides of the plates P P are planed trueand rest upon a series of rollers q q, journaled at their outer ends andconnected together by bars on each side, which are perforated to fit thepin-journals on the outer ends of the rollers, as is well understood.The rollers q q are supported upon the plates Q Q, the upper surface ofwhich is planed true, and the under side rests upon and is firmlysecured upon the top of the masonry in the piers M M.

Having thus described our invention, what We claim as new, and desire tosecure by Letters Patent, is-

1. An internally fired return tubular boiler, provided with two or morefurnaces with combustion chambers, which respectively connect the frontand back heads of the boiler, and open through both to a smoke flueoutside the back head, in combination with return tubes secured in bothheads, between and below the tops of the furnaces and combustion chamf Vbers.

2. An internally fired return tubular boiler arranged to dischargeproducts of combustion outside of its back and front heads respectively,into downward smoke flues, provided with cleansable receptacles forashes and cinders, below that pointin each flue, where the direction ofits gaseous current is changed and with doors leading into saidreceptacles.

3. An internally fired return tubular boiler provided with horizontalreturn tubes arranged in vertical lines in combination with a smoke boxon the front of the boiler into which said tubes open, and a cover forsaid smoke box made in jointed sections with the joints lying in planespassing between vertical lines of tubes, and each cover sectionhingedito the adjacent section so as to fold back upon it and leave alltubes normally covered by it exposed.

4. An internally fired boiler, provided with a smoke flue, the top ofwhich is the boiler, from which the two sides and one end of the flueare suspended, in combination with a seal of granular material supportedon the independent bottom of the flue and into which the suspendedplates extend to a depth which will practically exclude the air.

5. An internally fired boiler provided with two fixed supports at oneend and two roller supports at the other, the weight at the roller endtransmitted to the roller supports respectively, through two ball andsocket joints.

6. An internally fired return tubular boiler provided with two or morefurnaces, and a series of return tubes arranged between and below thefurnaces and a descending smoke flue on the front boiler head, whichflue is outside of and between and belowfthe fire door frames, and formsan extension of the ash pits under the furnaces.

WM. SELLERS. GEO. S. STRONG. H. B. BRADFORD.

Witnesses:

E, R. HARPER, W. H. WQLF.

